1 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 LSST – A Discovery Machine for ELT Era Science Beth Willman LSST Deputy Director GMT Community Science Workshop October 1, 2015

2 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 Figure from Ivezic et al. arXiv: LSST Basics O/NIR imaging survey from Cerro Pachon, Chile; 6.7m effective telescope aperture, 9.6 deg 2 field-of-view. ugrizy filters. Fiducial survey plans (observing strategy details still under discussion): ~1/2 the sky - ~18,000 deg 2 for “main” survey, ~25,000 deg 2 total, 30 seconds per visit ~90% of time on a universal survey Other 10%: deep drilling fields, “mini-surveys” ~900 visits per location over 10 years; r limit,single ~ 24.5 mag, r limit,stack ~ 27.5 mag

3 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 A community-based observing strategy study is underway LSST Observing Strategy

4 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 images from Ivezic et al. arXiv: The Deep Lens Survey image is an analog in depth and image quality to a single LSST epoch SDSS - 2’x4’ MUSYC 7.5‘x7.5’ The MUSYC image is ~1 mag shallower than the co-added LSST; highlights possible LSB science LSST-like Images

5 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 Discovery Volumes for Some Key Stellar Tracers Old, metal-poor MSTO ~140 kpc (single-visit), ~ 400 kpc (co-add) Horizontal branch ~500 kpc (single-visit), 1.6 Mpc (co-add) Old, metal-poor RGB ~3.5 Mpc (single-visit), 6 Mpc (co-add) RR Lyrae ~600 kpc (VanderPlas & Ivezic 2015)

6 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 Figure from Ivezic, Beers & Juric 2012 LSST Astrometry

7 GMT Community Science Meeting Monterey, CA October 1 – 3, M NSF MREFC + 168M DOE + 30M private donors ~18 billion objects in DR-1, 37 billion in DR trillion forced photometry, single-epoch sources in DR-11 Final database size: 15 Petabytes (15 million GB) Final, processed image collection: 500 Petabytes Millions of transient source alerts per night A New Scale of Survey Science

8 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 From M. Juric presentation, August 2015 Data Products Provided by LSST

9 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 From M. Juric presentation, August 2015 Data Products Provided by LSST See -> For Scientists -> Publications -> Key Project Documentswww.lsst.org Links to simulations (images, base catalogs, simulated operations) will soon be available as well

10 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 From M. Juric presentation, August 2015

11 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 From M. Juric presentation, August 2015

12 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 From M. Juric presentation, August 2015

13 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 From M. Juric presentation, August 2015 Data Products Provided by LSST

14 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 From M. Juric presentation, August 2015 Data Products Provided by LSST e.g. very crowded field photometry, brokers of nightly transient alerts, classification of RR Lyrae/Cepheids/etc, photometric metallicity, color- based star-galaxy separation

15 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 Kavli Futures workshop on The O/IR Capabilities Needed to Maximize LSST Science (organized by NOAO and LSST), Spring 2016 will build on the Elmegreen report Coordination with Other Facilities From Jim Ulvestad, August 2015:

16 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 from

17 GMT Community Science Meeting Monterey, CA October 1 – 3, 2015 You can get these slides at